Halo 3 finding online match?

[Joe]

I finally got halo 3 from my cousin and i want to play some online games. I pressed matching making and then this page of the matchmaking lobby comes up and i dont know what to do next. I want to play team slayer thats it!!

What do i do?

and it keeps on flashing saying one or more players do not have the maps required to play in this playlist. i only have the free map pack

 

[Possum]

you need to BUY the mythic and legendary map packs to play...i had the same problemthen i bought them and i could play =D